input/misc/atmel_captouch.c

83 static int atmel_read(struct atmel_captouch_device *capdev,
86 	struct i2c_client *client = capdev->client;
91 	if (len > sizeof(capdev->xfer_buf) - 2)
94 	capdev->xfer_buf[0] = reg;
95 	capdev->xfer_buf[1] = len;
99 	msg[0].buf = capdev->xfer_buf;
104 	msg[1].buf = capdev->xfer_buf;
111 	if (capdev->xfer_buf[0] != reg) {
114 			capdev->xfer_buf[0], reg);
118 	memcpy(data, &capdev->xfer_buf[2], len);
130 	struct atmel_captouch_device *capdev = data;
131 	struct device *dev = &capdev->client->dev;
137 	error = atmel_read(capdev, REG_KEY_STATE, &new_btn, 1);
145 	changed_btn = new_btn ^ capdev->prev_btn;
146 	capdev->prev_btn = new_btn;
148 	for (i = 0; i < capdev->num_btn; i++) {
150 			input_report_key(capdev->input,
151 					 capdev->keycodes[i],
155 	input_sync(capdev->input);
166 	struct atmel_captouch_device *capdev;
180 	capdev = devm_kzalloc(dev, sizeof(*capdev), GFP_KERNEL);
181 	if (!capdev)
184 	capdev->client = client;
186 	err = atmel_read(capdev, REG_KEY_STATE,
187 			    &capdev->prev_btn, sizeof(capdev->prev_btn));
193 	capdev->input = devm_input_allocate_device(dev);
194 	if (!capdev->input) {
199 	capdev->input->id.bustype = BUS_I2C;
200 	capdev->input->id.product = 0x880A;
201 	capdev->input->id.version = 0;
202 	capdev->input->name = "ATMegaXX Capacitive Button Controller";
203 	__set_bit(EV_KEY, capdev->input->evbit);
212 		__set_bit(EV_REP, capdev->input->evbit);
214 	capdev->num_btn = of_property_count_u32_elems(node, "linux,keymap");
215 	if (capdev->num_btn > MAX_NUM_OF_BUTTONS)
216 		capdev->num_btn = MAX_NUM_OF_BUTTONS;
219 					 capdev->keycodes,
220 					 capdev->num_btn);
227 	for (i = 0; i < capdev->num_btn; i++)
228 		__set_bit(capdev->keycodes[i], capdev->input->keybit);
230 	capdev->input->keycode = capdev->keycodes;
231 	capdev->input->keycodesize = sizeof(capdev->keycodes[0]);
232 	capdev->input->keycodemax = capdev->num_btn;
234 	err = input_register_device(capdev->input);
241 					"atmel_captouch", capdev);